Hi James, you may have a look at CISPR TR 16-4-4 (CISPR TR 16-4-4:2007+AMD1:2017+AMD2:2020 CSV | IEC Webstore<https://webstore.iec.ch/publication/66963>) that describes several methods for the derivation of limits.
Kind regards, Bernd Von: James Pawson (U3C) <ja...@unit3compliance.co.uk> Gesendet: Dienstag, 3. Mai 2022 11:42 An: EMC-PSTC@LISTSERV.IEEE.ORG Betreff: [PSES] Origin of steps in radiated emissions limit lines Hello all, A question I get asked by our customers, and that I've not found a satisfactory answer to, is why are there steps in the limit lines for radiated emissions? This kind of leads to the question of how do limit lines get specified in the first place? For emissions and immunity. I know that it relates to protection of radio receivers - the limits in CISPR 25 or EN 60945 are good examples - but how are the limits set? Apologies for the vague expression of the question! 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